what pistons are in the dohc zc? are they the p29? or the pm7 and what are the differences and what headgasket is better the y8 or z6 and is it good to run 14.1 compression on the street? i think thats alittle much


Modified by Honda Crx at 11:54 PM 11/2/2005


Modified by Honda Crx at 11:55 PM 11/2/2005

 

tttop

 

Ok, First of all, the USDM D16A1, commonly known as the "ZC", uses the P29 pistons. The JDM ZC uses PM7. They are pretty much the same to my knowledge. The D16Y8 headgasket is a thin metal headgasket that is probably a good idea to anyone who has had to scrap a stock D16A6 headgasket!! 14:1 is not good unless you have the valve train to support it, rods that can handle it, you can't just slap in those pistons and headgasket and expect not to do anything else you'll find yourself back in side that motor in a short period of time, Not to mention a high octane gas. Here's a lil compression calculator to play with. http://www.knology.net/~jediklc/D.htm

 

what about 13.1 or 13.6 compression, i want to get the head built but not right now just going to slap a crower stage 2 cam in there..

what rod bearings a rings would i get, well the rings would be the pm7 or the p29 ring set. but what rod bearing im going to use the stock rods. the pm7

and what is a good way to clean up the pistons.

 

bump.

 

can you run a z6 or y8 head gasket on a DOHC zc??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gnar kill &raquo;</TD></TR><TR><TD CLASS="quote">can you run a z6 or y8 head gasket on a DOHC zc?? </TD></TR></TABLE>

no...only on a sohc zc...

 

I'm putting the pm7 pistons in my z6,

 

toop

 

oic what you are doin now....if you want I got some d16a1 pistons and rods that are in good shape if you need em LMK

 

pm7's and p29's are identical so use either , as for rings once again you can use either. i wouldnt go over 12:1 cr on a street engine i run 11.9:1 in my dohc zc race engine

 

hey is the usdm d16a6 really considered a ZC like u said?? cuz thats what i got in my crx lol.... im bout to do a b18a swap lol.... just curious
thx

 

i've taken apart 2 USDM d16a1 88-89 engines and both contained pm7 pistons, not p29.

p29 is the code used for the OBD1 JDM DOHC ZC, so my guess is that it is the engine that contained the p29 pistons and they just replaced the pm7 part number (when you call acura and ask for 88-89 pistons, they give you p29s, even though the engines came with pm7)

 

i look all my parts lastnight and the pistons are pm7's so the rings i would get are the p29 rings. what rod bearings would i get?. I want a sort new block and how can I get the compression down to 12.1 different types of hg's. cause with the z6 hg the comression would be 13.6 the a6 headgasket would be 13.1 but i dont think i can use the a6 gasket because of the oil sprayer in the block.

 

I ordered a set of 88-89 Integra pistons...I don't remember what the code was, but they were physically the same as the old ZC pistons I found for comparison. There is one difference though...the jdm dohc zc pistons had a moly coat on the skirt.
The Integra pistons were bare.
I later found supporting documentation in the Honda online JDM Factbook for this information.

 

thank you for the information i have the jdm dohc zc pm7's going into my d16z6.. hoping that they will hold up.

 

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Bottom.

Gratuitous bumping...bad form.

 

I was wondering about streetability also, I have some PM7's that Im gonna throw into a sohc vtec zc block. Can I put them in and run it on pump gas?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DArecluse &raquo;</TD></TR><TR><TD CLASS="quote">I was wondering about streetability also, I have some PM7's that Im gonna throw into a sohc vtec zc block. Can I put them in and run it on pump gas?</TD></TR></TABLE>

im trying to get some answers..

 

SOHC D16 with DOHC ZC pistons (PM7 or P29) with Z6 head and A6 gasket will give you compression ratio of 11.66:1 - with Y8 or Z6 gasket, it will be 12.03:1 - with 2 layer Y8 gasket, it will be 12.46:1 - if head or block deck is milled, compression ratio will go up